61902978 has 32 divisors (see below), whose sum is σ = 127161600. Its totient is φ = 20082816.

The previous prime is 61902947. The next prime is 61903003. The reversal of 61902978 is 87920916.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33708 + ... + 35496.

It is an arithmetic number, because the mean of its divisors is an integer number (3973800).

Almost surely, 2^61902978 is an apocalyptic number.

61902978 is an abundant number, since it is smaller than the sum of its proper divisors (65258622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61902978 is a wasteful number, since it uses less digits than its factorization.

61902978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 61902978 is about 7867.8445587086. The cubic root of 61902978 is about 395.5826001944.

The spelling of 61902978 in words is "sixty-one million, nine hundred two thousand, nine hundred seventy-eight".